McDonnell & Miller 310473 Kit

Ensuring consistent performance in steam and hydronic installations requires precise sediment management. The McDonnell & Miller 310473, also known as the STR-WF2 Strainer and Orifice Kit, is the critical service component for WF-2 Series Uni-Match Water Feeders. Professionals recognize that a clogged boiler water feeder strainer is the primary cause of restricted flow and potential dry-fire conditions. This comprehensive replacement kit includes a high-grade stainless steel strainer screen and a precisely calibrated flow control orifice plate to maintain the optimal 147°F to 250°F operational window typical of these Xylem systems.

When performing routine maintenance or troubleshooting a slow-fill issue, replacing the STR-WF2 ensures that internal components remain free from scale and pipe dope. The rugged construction of the McDonnell & Miller replacement parts within this kit allows for reliable filtration under standard system pressures. For technicians servicing WFE Uni-Match models, this kit is the standard for restoring factory-spec flow rates without the need for total valve replacement. Proper installation of the water feeder orifice maintains the pressure differential required for the solenoid to cycle correctly.

Key Benefits for Technicians:

• Optimized Flow Control: The included STR-WF2 orifice ensures the water feeder delivers the exact volume required by the boiler’s evaporation rate.
• High-Efficiency Filtration: The stainless steel strainer traps fine particulates to prevent solenoid seat damage and sticking.
• Direct OEM Compatibility: Specifically engineered for the McDonnell & Miller WF-2 and WFE series, eliminating guesswork during field repairs.
• System Protection: Reduces debris-related callback by shielding the water feeder's internal valve mechanisms.

Common Questions:

How do I know if the WF-2 strainer needs to be replaced?
If you notice the boiler taking an unusually long time to recover water levels or if the feeder cycles frequently without significant water delivery, the strainer screen is likely fouled with sediment.

Will this kit work with the WFE Uni-Match models?
Yes, the 310473 (STR-WF2) is the standard replacement kit for both the WF-2 and the electronic WFE series water feeders.

Can I clean the old strainer instead of replacing it?
While cleaning is possible, the microscopic pitting and scaling on a veteran strainer screen often lead to rapid re-fouling. Replacing the orifice and strainer together ensures the system returns to its original calibrated performance.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.